From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Cost comparison and production analysis for introducing Die Casting Aluminium Main Spring Housings on the Phantom III front suspension.
| Identifier | ExFiles\Box 95\2\ scan0232 | |
| Date | 21th September 1937 | |
| To BY.{R.W. Bailey - Chief Engineer} From RHC{R. H. Coverley - Production Engineer}/SB.{Mr Bull/Mr Bannister} c. to Rm.{William Robotham - Chief Engineer} c. to Hs.{Lord Ernest Hives - Chair} DES 346 RHC{R. H. Coverley - Production Engineer}/SB.{Mr Bull/Mr Bannister}1/MJ.21.9.37. PHANTOM III FRONT SUSPENSION. In reply to By.19/N.3.9.37, we have looked into the question of introducing the Die Casting Aluminium Main Spring Housings G.83606/7 on Production, and find that these could be brought in on the 167th. Chassis on 'D' Series without Scrap. This Chassis is scheduled for completion about December 1938 which should allow ample time to produce and develop the Dies before the parts are required. We would also point out that several of these Housings are at present being produced in Ley's Malleable Iron which was intended as a further alternative, but since the Aluminium parts have now completed 17,000 miles successfully on 32-EX. it will be unnecessary to proceed with these. The comparative Costs are as follows - Factory Cost of Finished parts. Present Standard (S/M.{Mr Moon / Mr Moore} Forgings.) .... £6. 10. 6d. per pair. Ley's Malleable Castings. (Metal pattern Costs £57.) .... £4. 0. 0d. per pair. R.R. Alum Die Castings. (Die Costs £115.) .... £2. 11. 4d. per pair. The Die Cost of £115 for Aluminium Castings would be recovered after producing 29 cars, henceforth there would be a saving of £3. 19. 2d. per Chassis, but it should be emphasised that Design alterations cannot be introduced after Production of Dies has been embarked upon. RHC{R. H. Coverley - Production Engineer}/S. Bannister. | ||